Vulnerability-Lookup

CVE-2026-4942 (GCVE-0-2026-4942)

Vulnerability from cvelistv5 – Published: 2026-07-17 19:32 – Updated: 2026-07-20 13:52

Title

IBM i is Affected by Algorithm Downgrade in Transport Layer Security []

Summary

IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration.

Severity

5.9 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-20 13:52 UTC

CWE

CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

Assigner

ibm mitre root

References

1 reference

URL	Tags
https://www.ibm.com/support/pages/node/7278992	vendor-advisorypatch

Impacted products

1 product

Vendor	Product	Version	CPE status
IBM	i	Affected: 7.6 Affected: 7.5 Affected: 7.4 Affected: 7.3 cpe:2.3:a:ibm:i:7.6:::::::* cpe:2.3:a:ibm:i:7.6.0:::::::* cpe:2.3:a:ibm:i:7.5:::::::* cpe:2.3:a:ibm:i:7.5.0:::::::* cpe:2.3:a:ibm:i:7.4:::::::* cpe:2.3:a:ibm:i:7.4.0:::::::* cpe:2.3:a:ibm:i:7.3:::::::* cpe:2.3:a:ibm:i:7.3.0:::::::*

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                }
              ],
              "value": "IBM i Release5770-SS1\nPTF Number(s)PTF Download Link(s)7.6MJ09141 https://www.ibm.com/mysupport/s/fix-information?legacy=MJ09141 7.5MJ09140 https://www.ibm.com/mysupport/s/fix-information?legacy=MJ09140 7.4MJ09139 https://www.ibm.com/mysupport/s/fix-information?legacy=MJ09139 7.3MJ09138 https://www.ibm.com/mysupport/s/fix-information?legacy=MJ09138 \n\n\n\nIBM recommends users running unsupported versions of affected products upgrade to a supported and fixed version of affected products."
            }
          ],
          "title": "IBM i is Affected by Algorithm Downgrade in Transport Layer Security []",
          "x_generator": {
            "engine": "ibm-cvegen"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "9a959283-ebb5-44b6-b705-dcc2bbced522",
        "assignerShortName": "ibm",
        "cveId": "CVE-2026-4942",
        "datePublished": "2026-07-17T19:32:02.440Z",
        "dateReserved": "2026-03-26T21:14:44.344Z",
        "dateUpdated": "2026-07-20T13:52:49.123Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

FKIE_CVE-2026-4942

Vulnerability from fkie_nvd - Published: 2026-07-17 20:17 - Updated: 2026-08-12 19:00

Severity

5.9 (Medium) - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Summary

References

	URL	Tags
	psirt@us.ibm.com	https://www.ibm.com/support/pages/node/7278992	Vendor Advisory

Impacted products

Vendor	Product	Version
ibm	i	7.3
ibm	i	7.4
ibm	i	7.5
ibm	i	7.6

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "cpes": [
            "cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:*",
            "cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:*"
          ],
          "product": "i",
          "vendor": "IBM",
          "versions": [
            {
              "status": "affected",
              "version": "7.6"
            },
            {
              "status": "affected",
              "version": "7.5"
            },
            {
              "status": "affected",
              "version": "7.4"
            },
            {
              "status": "affected",
              "version": "7.3"
            }
          ]
        }
      ],
      "source": "psirt@us.ibm.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:ibm:i:7.3:*:*:*:*:*:*:*",
              "matchCriteriaId": "9A49E8C5-7967-42AE-A787-C533D24A63D7",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:ibm:i:7.4:*:*:*:*:*:*:*",
              "matchCriteriaId": "92D03306-B6C9-403E-99A2-CE9D8DC3B482",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:ibm:i:7.5:*:*:*:*:*:*:*",
              "matchCriteriaId": "F7CCB5BF-08EF-472F-A663-5DE270234F10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:ibm:i:7.6:*:*:*:*:*:*:*",
              "matchCriteriaId": "AFFF96C2-7E0F-4DF9-AF51-3EE357D51095",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration."
    }
  ],
  "id": "CVE-2026-4942",
  "lastModified": "2026-08-12T19:00:35.210",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.9,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.2,
        "impactScore": 3.6,
        "source": "psirt@us.ibm.com",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-4942",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-07-20T13:52:40.695670Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-07-17T20:17:23.560",
  "references": [
    {
      "source": "psirt@us.ibm.com",
      "tags": [
        "Vendor Advisory"
      ],
      "url": "https://www.ibm.com/support/pages/node/7278992"
    }
  ],
  "sourceIdentifier": "psirt@us.ibm.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-757"
        }
      ],
      "source": "psirt@us.ibm.com",
      "type": "Secondary"
    }
  ]
}

GHSA-CFFX-9Q2G-R6HP

Vulnerability from github – Published: 2026-07-17 21:31 – Updated: 2026-07-17 21:31

Details

Severity

5.9 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-4942"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-757"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-17T20:17:23Z",
    "severity": "MODERATE"
  },
  "details": "IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration.",
  "id": "GHSA-cffx-9q2g-r6hp",
  "modified": "2026-07-17T21:31:44Z",
  "published": "2026-07-17T21:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4942"
    },
    {
      "type": "WEB",
      "url": "https://www.ibm.com/support/pages/node/7278992"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-4942 (GCVE-0-2026-4942)

FKIE_CVE-2026-4942

GHSA-CFFX-9Q2G-R6HP

Tags

Sightings

Nomenclature

Related by attack behaviour